By 1969, Delo was now in Los Angeles moving on with his career; making guest TV appearances on shows such as Mission: Impossible and Here's Lucy. His introduction to Lawrence Welk came from Arthur Duncan, the show's featured tap dancer who had known Delo from their days in Australia. Upon Duncan's recommendation, the maestro invited him on the show as a guest star, singing the Hawaiian Wedding Song. Three more guest appearances and positive viewer response led Lawrence to hire him as a full-time performer for the 1969-70 season, and remained on for the remainder of the show's run. Delo's performances frequently involved his sitting in the audience, singing directly to various female show-goers.

After the show ended, Delo continued his performing career, either on the road with his fellow Welk stars or as a headliner at the Lawrence Welk Resort in Branson, Missouri, from 1994 to 1999. He also became an author, penning the novel The Frozen Horror.

He now lives in Gilbert, Arizona, with his wife Marilyn. His record label KimKev Records is named after his two children, Kimberly and Kevin.